<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        header,nav,article,footer{
            border: solid 1px #666;
            padding: 10px;
            margin: 6px;
        }
        header{
            width: 960px;
        }
    </style>
</head>
<body>
<header>导航</header>
<nav>菜单</nav>
<article>内容</article>
<footer>底部说明</footer>
</body>
</html>